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Just make sure the walls aren't too thin. i do 1.2mm all over and no infill. Even complete spheres print fine like this. You only need infill if the layer is flat or begins lower than the surrounding area, but you could always hollow out the model in a 3D program and just print with supports and it will still save a lot of time and filament in the long run. Infill is usually pointless unless you are making working parts, for art stuff don't waste your time, it easy to just drill a small hole and fill it with plaster of paris to make it heavier .

here are two objects printed with no infill or support. walls 1.2mm which i think is the perfect thickness.

ignore print quality, and the gold one is just some gold leaf slapped on the model as a test, but i'm just trying to show the fact you dont need infill as much as you think. From experience, if you make the walls too thin then it wobbles when you print and the surface quality isn't as good as with thicker walls.

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These are my settings and cura version if you were wondering, im not using the new cura, as i come from the universe of if it ain't broke don't fix it. I have zero issues with this one so i see no need what so ever for further development, especially aesthetic ones. i'm sure others would argue differently, but i'll leave that opinion for another thread.

I print everything with these setting and only adjust the speed, the quickest i print is at 70mm/s and slowest 35, then 50. i print 210 at 35 218ish at 50 and 225ish at 70.

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I have just recently made a little mistake in making my walls too thin in the 3D app i was using because i intended to print the object much bigger, which meant the walls are now also smaller. I made the eyes extra thick which is why they printed ok. this model is so thin i think its about 0.2-0.3 mm thick. and ripped off the plate, and full of holes. Just a warning about scaling your objects, i'm very casual about this stuff, but its very important as if you model something with 1.2 mm walls or whatever, then never scale it down too much in cura as it makes the walls too thin to print. i make everything flat (no polygon thickness) and give its thickness in the 3d app by extruding inwards, then use 1.2 mm walls to make it solid i think its a good workflow as it means i have full control. here are the pics of my recent too thin print to highlight what im on about...

and the holes....

I think i actually used more filament on the support material than the actual model, lol! 3.5m

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If your model is closed, then scale away, but if its open like mine, then its paramount you get get the shell thickness right during modelling.

By the way its 1.2mm as a division of the size of the stock UM2 nozzle which is 0.4, you should stick to this rule, basically 0.4, 0.8, 1.2, 1.6......you get the drift. otherwise you are forcing the printer to spit out either too much or not enough plastic for it diameter, or do multiple passes or something, dont quote me on that though i could be wrong, but stick to divisions of 0.4 for sure unless you're using a different nozzle.

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